SU62603A1 - The method of producing vinyl chloride - Google Patents

Description

To obtain chloride | Two main reactions are known for vinyl:

1. From dichloroethane by cleavage of hydrogen chloride with alkaline ageites or catalytically.

The reaction proceeds according to the equation:

C2H4Cl -V- CHCl CHo-i-HC

2. From acetylene by addition of hydrogen chloride using various catalysts (HgCU, Cn2Cl2 + NH.iCl and others). The reaction proceeds according to the equation:

CzHi + HCl CHChCHs

The author of the present invention has found that in preparing chloride vinyl chloride from dichloroethane by catalytic removal of hydrogen chloride, the latter can be directly attached to acetylene using catalysts commonly used for this, without intermediate isolation of vinyl chloride formed from dichloroethane.

As a result of this process, two moles of vinyl chloride can be obtained from 1 mole of dichloroethane and 1 mole of acetylene by the reaction:

C2I2 + C, H4Cl2 -x- 2CHC1: CHa

The method is carried out as follows. Dichloroethane is passed over one or another catalyst, causing it to break down into vinyl chloride and HCI, like rianpiiMCp, over activated charcoal itself, or with different ;;; dg-bazkov, at a temperature not lower than n at a different rate at which the conversion of dichloro-sota occurs completely or partially in part.

The mixture of reaction products, consisting of chloride, hydrogen chloride, and unreacted dichloroethane, is separated from the latter with the help of water condeisatorle, after which acetylene is added to the single mixture in an amount that is -1m

Lo 62603

to bind all the hydrogen chloride present in the gas mixture (and even better, acetylene is added in double vs quantity theory), and the entire mixture is put into the reactor or irrigation column containing the catalyst solution to accomplish the second stage of the synthesis of vinyl chloride from acetylene and hydrochloric acid. The catalysts for this stage of the process can be saline solutions of chlorine mercury or copper chloride with ammonium chloride under the usual conditions adopted to carry out the reaction of synthesis of vinyl chloride from acetylene and hydrochloric acid. The final reaction product mixture leaving the reactor or reaction column is washed with water or alkaline solutions from entrained hydrogen chloride and sent to absorb vinyl chloride with cooled xylene or other sorbent, and the excess acetylene is returned to recycling.

The proposed continuous process for the production of vinyl chloride is easy to adjust and does not require the consumption of other reagents other than dichloroethane and acetylene of any origin. When the process is adjusted, no by-products are obtained and all the chlorine contained in dichloroethane is used by the cavity to obtain vinyl chloride.

Subject invention

A method of producing vinyl chloride, characterized in that acetylene is added to gaseous gas obtained after passing dichloroethane at elevated temperatures over catalysts for the process of splitting hydrogen chloride and the resulting gas mixture is passed over the catalysts to serve to add hydrogen chloride to acetylene.